package org.malred.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import lombok.extern.slf4j.Slf4j;
import org.malred.common.BaseContext;
import org.malred.common.R;
import org.malred.entity.ShoppingCart;
import org.malred.service.ShoppingCartService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

@Slf4j
@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     *
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart) {
        log.info("购物车数据: {}", shoppingCart);
        // 设置用户id, 指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        // 查询当前菜品或套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);

        if (dishId != null) {
            // 添加的是菜品
            queryWrapper.eq(ShoppingCart::getDishId, dishId);
        } else {
            // 添加的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
        }

        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if (cartServiceOne != null) {
            // 如果已存在, 就在原来数量上加1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        } else {
            // 如果不存在, 则添加到购物车, 数量默认是1
            shoppingCart.setNumber(1);
            // 没有设置@InsertFill, 手动设置
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }

        return R.success(cartServiceOne);
    }

    /**
     * 减少购物车
     *
     * @param shoppingCart
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart) {
        log.info("购物车数据: {}", shoppingCart);
        // 设置用户id, 指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        // 查询当前菜品或套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);

        if (dishId != null) {
            // 添加的是菜品
            queryWrapper.eq(ShoppingCart::getDishId, dishId);
        } else {
            // 添加的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
        }

        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if (cartServiceOne != null) {
            // 如果已存在, 就在原来数量上-1
            Integer number = cartServiceOne.getNumber();
            if (number >= 1)
                cartServiceOne.setNumber(number - 1);
            if ((number - 1) == 0) {
                shoppingCartService.removeById(cartServiceOne.getId());
            } else {
                shoppingCartService.updateById(cartServiceOne);
            }
        } else {
            return R.error("数据不存在");
        }

        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list() {
        log.info("查看购物车");

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
        return R.success(list);
    }

    /**
     * 清空购物车
     *
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean() {
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());

        shoppingCartService.remove(queryWrapper);

        return R.success("清空购物车成功");
    }
}
